Combining Texts

You have chosen 'Thinking About Mathematics' by Stewart Shapiro, 'The Epistemology of Essence (draft)' by Tuomas E. Tahko and 'Philosophy of Mind (Encylopedia III)' by Georg W.F.Hegel

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All the ideas for Modality, or select a subheading:
      A. Necessity
      B. Possibility
      C. Sources of Modality
      D. Knowledge of Modality
      E. Possible worlds